Improvement in barometers



E. C. WAGNER.

,BAROMETEIL Patented Oct. 3,1876.

MPETERS. FHDYO-LITMGGRAFNEH, WASHINGTON, Dv C.

PATENT OFFICE.

EDMU'ND C. WAGNER, OF FORT SENECA, OHIO.

IMPROVEMEN'T IN BIAROMETERS.

Specification forming part of Letters Patent N o. 182,779, dated October 3, 1876; application filed February 23, 1876.

full, clear, and exact description of the construction, principle, and operation of the same, reference being had to the annexed drawings,

x making a part of this specification, in-which- Figure l is a perspective view; Fig. 2, a back View, with cap removed, showing the entire working parts of the machine; Fig. 3, cap removed 5 Fig. 4end view of section of spring E E, 4(Shown in Fig. 2.)

A, Fig. 1,is a dial, with dry, very dry, &c., marked in margin. B is a hand or indicator made to revolve by the gearing C and D. Shown in Fig. 2.) The under part ofthe spring E, Fig. 4, is some close-grained, hard wood, not susceptible to dampness or moisture, and laid lengthwise with the grain, Vand very thin. The upper part f is composed of some soft, spongy wood, very susceptible to dampness or moisture, and about three times as thick as the under part, laid crosswise with the grainthat is, thegrain ofthe under part and the upper part forming right angleswith two or more slots or grooves running through the upper part f of the spring lengthwise to admit the atmosphere freely, as shown in Fig. 4. Now, in the presence of moisture in the atmosphere, which precedes all rains, the upper part of the spring immediatelyabsorbs the moisture, thus causing it to swell or` A gr, cut lengthwise through the spring and across the grain of the soft or porous part f, by

this means exposing to the action of the atmosphere more surface than could be done in any otherway.

I claim as my invention- A barometer `constructed of two pieces of wood, E and f, suitably connected together, mounted in a suitable frame, and provided with gearing D O, dial A, and indicator B, substantially as described, and for the purposes set forth.

I EDMUND C. WAGNER.

Witnesses:

JNO. M. MYERS, E. B. MYERS. 

